<?php 
class CustomValidatedFile extends sfValidatedFile  { 
	public function generateFilename() 
	{ 
		//return sha1($this->getOriginalName().rand(11111, 99999)).$this->getExtension($this->getOriginalExtension()); 
		//return $this->getOriginalName();
		return date("Ymd")."_".date("His").$this->getExtension($this->getOriginalExtension());
	} 
}